人民币形式

人民币形式：
        decimal price;
        decimal discount;
        decimal discounted_price;

        // compute discounted price
        price = 19.95m;
        discount = 0.15m; // discount rate is 15%

        discounted_price = price - (price * discount);

        Console.WriteLine("Discounted price: {0:C}", discounted_price);